linux-kernel - [PATCH rcu 0/18] Miscellaneous fixes for v5.15

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Message-ID: <20210721202042.GA1472052@paulmck-ThinkPad-P17-Gen-1>
Date:   Wed, 21 Jul 2021 13:20:42 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org
Subject: [PATCH rcu 0/18] Miscellaneous fixes for v5.15

Hello!

This series provides miscellaneous fixes:

1.	Fix to include first blocked task in stall warning, courtesy of
	Yanfei Xu.

2.	Fix stall-warning deadlock due to non-release of rcu_node ->lock,
	courtesy of Yanfei Xu.

3.	Remove special bit at the bottom of the ->dynticks counter,
	courtesy of "Joel Fernandes (Google)".

4.	Weaken ->dynticks accesses and updates.

5.	Mark accesses to ->rcu_read_lock_nesting.

6.	Unify documentation about missing list_empty_rcu(), courtesy of
	Julian Wiedmann.

7.	Handle VM stoppage in stall detection, courtesy of Sergey
	Senozhatsky.

8.	Do not disable GP stall detection in rcu_cpu_stall_reset(),
	courtesy of Sergey Senozhatsky.

9.	Start timing stall repetitions after warning complete.

10.	Mark read-side data races.

11.	Mark lockless ->qsmask read in rcu_check_boost_fail().

12.	Make rcu_gp_init() and rcu_gp_fqs_loop noinline to conserve stack.

13.	Remove trailing spaces and tabs, courtesy of Zhen Lei.

14.	Mark accesses in tree_stall.h.

15.	Remove useless "ret" update in rcu_gp_fqs_loop(), courtesy of
	Liu Song.

16.	Use per_cpu_ptr to get the pointer of per_cpu variable, courtesy
	of Liu Song.

17.	Explain why rcu_all_qs() is a stub in preemptible TREE RCU,
	courtesy of Frederic Weisbecker.

18.	Print human-readable message for schedule() in RCU reader.

						Thanx, Paul

------------------------------------------------------------------------

 b/include/linux/rculist.h  |   35 +++++++-------
 b/include/linux/rcupdate.h |    2 
 b/include/linux/rcutiny.h  |    3 -
 b/include/linux/srcutiny.h |    8 +--
 b/kernel/rcu/srcutiny.c    |    2 
 b/kernel/rcu/tasks.h       |    2 
 b/kernel/rcu/tree.c        |   77 +++++---------------------------
 b/kernel/rcu/tree.h        |    2 
 b/kernel/rcu/tree_plugin.h |    9 ++-
 b/kernel/rcu/tree_stall.h  |    4 -
 b/kernel/sched/core.c      |   11 ++++
 kernel/rcu/tree.c          |   62 ++++++++++++++++----------
 kernel/rcu/tree_plugin.h   |    2 
 kernel/rcu/tree_stall.h    |  107 ++++++++++++++++++++++++++++-----------------
 14 files changed, 165 insertions(+), 161 deletions(-)